Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9caa120138e8e7…

MALICIOUS

PDF

76.1 KB Created: 2021-02-23 08:29:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: dc451063d2f3de510a85ed3ad69c6d86 SHA-1: 592132b0219066aabef032d78c3c87f20a05bd84 SHA-256: 4f9caa120138e8e73abe3d297f58eb78c9b8a7f244890c559e0fce4b697b6598
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/strik?utm_term=what+child+is+this+lyrics+and+chords PDF link annotation
    • https://tasototunone.weebly.com/uploads/1/3/4/7/134755659/bazabopu-jaweponil.pdfIn PDF document text
    • https://zuzedunili.weebly.com/uploads/1/3/4/4/134460484/500e0ca94a0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454544/normal_5fea36d800da2.pdfIn PDF document text
    • http://adminhalil.com/fenomenologia_del_espiritu_wenceslao_roces9i9p5.pdfIn PDF document text
    • http://reform-st.ru/94554108817vixwd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497109/normal_60050ce480313.pdfIn PDF document text
    • http://alteramaks.world/sewigegarumavavowezufubar4ub6s.pdfIn PDF document text
    • http://goodxday.xyz/the_exorcist_movie_reviewl3z58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387226/normal_60302f5569fef.pdfIn PDF document text
    • http://dehydratedoriginalgoodness.com/25769548629si0dj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484807/normal_603359ed9692e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/liwafo/how_to_sew_a_simple_dress_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/what_is_needed_to_learn_cloud_computing.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/antipasto_pro-_demibold_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/zowukirizow.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/python_string_format_output.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/bithiri_sathi_bathukamma_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/30184352952.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 5144 bytes
SHA-256: 33abc6b314e8c498eefaada4e054158a4c0f43eac2e581cb473b2800cb41ab21
font_01_sfnt_off0000ff2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2F 10392 bytes
SHA-256: bc37f18ec604ccc7c2d5684a857a81fae76ecd37974a3420345a5a861081768c

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